How to reuse molds
A mold and process technology, applied in the field of mold reuse, can solve the problems of short service life of porous alumina layer and high frequency of moth eyes
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experiment example 1
[0092] A small piece was cut out from the moth-eye mold 100u, and the aluminum residual layer 18r of the moth-eye mold 100u was anodized under the same conditions as in the anodizing process for producing the moth-eye mold 100. That is, the remaining aluminum layer 18r of the moth-eye mold 100u was anodized at an applied voltage of 80V using an aqueous oxalic acid solution (concentration: 0.3% by mass, liquid temperature: 10°C) as an electrolytic solution. In addition, phosphoric acid aqueous solution (10 mass %, 30 degreeC) was used for etching of the anodized aluminum oxide layer 18a. In addition, according to experiments by the inventors of the present invention, the etching rate of phosphoric acid aqueous solution (10% by mass, 30° C.) for aluminum is one-seventh or less of the etching rate for anodized aluminum, even if it is estimated to be higher.
[0093] Change the anodizing time to 300 seconds, 800 seconds, 1200 seconds, 1600 seconds, 2400 seconds, 60 minutes and 90 ...
experiment example 2
[0096] Attempts were made to reduce the voltage required for anodizing the aluminum residual layer 18r by reducing the thickness of the barrier layer of the porous alumina layer 14 . Similar to the reference experiment example and experiment example 1, a small piece was cut out from the above moth-eye mold 100u, and this was used as a mold sample.
[0097] The porous aluminum oxide layer 14 was etched prior to anodizing the residual aluminum layer 18r of the mold sample. Etching prior to anodizing is sometimes referred to as "pre-etching". The same phosphoric acid aqueous solution (10% by mass, 30° C.) as the etching solution in Experimental Example 1 was used as the etching solution for pre-etching. The pre-etching time is set to 5 minutes, 15 minutes, 30 minutes, 45 minutes, 60 minutes, 90 minutes, 120 minutes and 180 minutes. For each pre-etched mold sample, anodic oxidation was performed on the remaining aluminum layer 18r for 60 minutes using an oxalic acid aqueous solu...
experiment example 3
[0103] The preferred ranges of anodization time and etching time were investigated. A small piece was cut out from the above-mentioned moth-eye mold 100 u in the same manner as in the reference experiment example and experiment examples 1 and 2, and a phosphoric acid aqueous solution (10% by mass, 30° C.) was used in the etching solution for pre-etching in the same manner as in experiment example 2, and the pre-etching time was set to Set to 60 minutes. Use oxalic acid aqueous solution (concentration 0.3 mass %, liquid temperature is 10 ℃) in anodic oxidation, anodic oxidation voltage is 45V, make anodic oxidation time by 13 minutes 20 seconds, 30 minutes, 60 minutes, 90 minutes, 120 minutes change, make The etching time was changed to 60 minutes, 90 minutes, and 120 minutes.
[0104] No cutting marks were found in the samples whose anodization time was 60 minutes or more and etching time was 60 minutes or more. No chipping marks were found in the samples with an etching tim...
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